Since I've posted I've read more about the artifacts. So there are artifacts and artifacts. The ones in the examples are caused by the bump value being too high. Easy to find that out when I decreased it and they went away. The others that look like smudges seem to be from the Shadow Min Bias set too high. I think... Now a P6 question which is also a P5 question. Do you attach the bump to the Bump channel or the Displacement channel? I've done both and don't really see a difference. Is it just a personal preference? And why is the Gradient Bump still there? I thought it was only for P4 bum bumps.